Search and rescue teams had initially recovered two bodies on Sunday but two more were found as efforts continued throughout the night, KWS said on its official Twitter page.

“Two more bodies were recovered overnight, bringing the total number of the dead from the tragic flash floods to four people,” the service said Monday morning. Search operations are underway for the three people still missing.

“The gorge in Hell’s Gate National Park has been closed to the public with immediate effect due to continuing rains,” KWS said Sunday.

It added that a helicopter was being dispatched from the capital Nairobi, which is about 100 kilometers (62 miles) southeast of the park, to help with search efforts.